Can you tell if the apostrophes are used correctly in the following sentences?

1. Samson asked the cashier for the key to the men’s room.
   • a) correctb) incorrect
2. Nathan and Simone’s descriptions of the crime did not match.
   • a) correctb) incorrect
3. You’re coffees getting cold.
   • a) correctb) incorrect
4. After the hockey game, Shauna went to the Smiths’ house for hot chocolate.
   • a) correctb) incorrect
5. Casey’s 6s and 0s looked the same.
   • a) correctb) incorrect
6. The director told us that it’s time to get down to business.
   • a) correctb) incorrect
7. Yoshi lived in London during the 1960’s.
   • a) correctb) incorrect